Seismic Response And Dynamic Stability Analysis Of Long-Span Kiewitt-Lamella Suspend-dome Structure Under Multi-Support And Multi-Dimentional Earthquake Excitations

As a new type of composite spatial "hybridized" structure system, the suspend-dome based on the concept of integral tension structure is composed of single-layer reticulated shell and cable dome cleverly. And the suspend-dome system more and more economical and reasonable in large space covering for its combing the advantages of fore-mentioned structural systems. However the larger its span is, the more obvious the difference of each support point under earthquake excitation is.Therefore, The study of the static performance and dynamic stability under uniform and multi-support excitation for the Kiewitt-Lamella suspend-dome structure of 120 m span is conducted by using the finite element software ANSYS. The specific contents and main conclusions of this paper are as follows:(1) The research on static performance of the structure is carried out, considering the rise-span ratio, brace height, the value of the prestressed cable and the initial defect separately. It shows that the rise-span ratio has a enormous influence on the stability bearing capacity; the brace can significantly improve the mechanical properties of the upper-layer reticulated shell; the value of the prestressed cable play a decisive role to the value of the support reaction; the long-span suspend-dome structure is sensitive to defect and the defect should be strictly controlled in the actual long-span suspend-dome structure project.(2) By comparing the seismic response analysis between uniform and multi-support excitation, it is found that the structural response in the first situation is generally bigger. It is suggested that the seismic check of elements may ignore the seismic bearing capacity adjustment factor for reducing the adverse impact of not considering multi-support excitation in the small-span and medium-span structure.(3) Comparative analysis on dynamic stability of structure under horizontal unidirectional, horizontal two-dimensional and three-dimensional excitations considering the effect of traveling wave is calculated. It is found that the destabilized mode of structure is similar; the dynamic stability bearing capacity of the structure is lower under multi-support excitation; in practical application, it should be avoidedwith only a seismic wave to conduct the time-history analysis and more reasonable seismic waves should be take into account to consider the most adverse situation under earthquake excitation when designing the structure; for the large-span space structure, multi-support and multi-dimentional earthquake excitations should be all considered.The result of this paper can provide valuable reference for the actual project and the subsequent theoretical analysis.